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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in-Capital [Member]
Retained Earnings [Member]
Balance, shares at Dec. 31, 2015   139,076 508    
Balance at Dec. 31, 2015 $ 2,319,342 $ 1,376 $ (13,620) $ 1,497,065 $ 834,521
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock, shares   39,100      
Issuance of common stock 182,791 $ 391   182,400  
Stock-based compensation, shares   3,354      
Stock-based compensation 20,109     20,109  
Vesting of restricted shares 0 $ 12   (12)  
Equity component of senior unsecured convertible notes, net 55,865     55,865  
Treasury stock - tax withholdings, shares   (344) (344)    
Treasury stock – tax withholdings (2,275)   $ (2,275)    
Net loss (188,328)       (188,328)
Balance, shares at Sep. 30, 2016   181,186 852    
Balance at Sep. 30, 2016 $ 2,387,504 $ 1,779 $ (15,895) $ 1,755,427 $ 646,193